eventRealtimeOffset
Used when the replayer is actively playing and emitting replay events. Call this from your ReplayEventsObserver to offset the current time to accurately represent when the simulated or historical event occurred - needed for sub-millisecond accuracy or when simulating routes at high frequencies @see ReplayRouteOptions.frequency.
Return
the difference in realtime and the event replayed
Parameters
eventTimestamp
to get the realtime offset for